Which three commands must you enter to create a trunk that allows VLAN 20?

Which three commands must you enter to create a trunk that allows VLAN 20? (Choose three.)
A. Switch(config-if)#switchport mode trunk
B. Switch(config-if)#switchport mode dynamic desirable
C. Switch(config-if)#switchport trunk native vlan 20
D. Switch(config-if)#switchport trunk encapsulation dot1q
E. Switch(config-if)#switchport trunk allowed vlan 20
F. Switch(config-if)#switchport mode dynamic auto

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